Texture streaming
Texture streaming can reduce loading time and memory usage by loading textures partially when appropriate. All textures will load only low resolution mip levels first, and after loading is complete and scene rendering is going, higher resolution mips will be loaded on demand. This can result in a slight delay in loading texture detail, but this is handled by smoothly introducing new mip levels with trilinear mipmap fading. Textures that are not on screen for a while will also stream their high resolution mipmaps out to reduce memory usage. The video shows this process slowed down to be easier to see what's happening.
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